| Abbreviation | Definition |
|---|---|
| IUM | Institute of Urban Meteorology |
| IWR | Internet Weather Report |
| IWRPC | Improved Weather Reconnaissance System Program Council |
| IWRS | Improved Weather Reconnaissance System |
| JAG | Joint Action Group |
| JAMC | Journal of Applied Meteorology and Climatology |
| JAMI | Japanese Advanced Meteorological Imager |
| JASL | Joint Archive for Sea Level |
| JAWOP | Joint Automated Weather Observation Program |
| JCRMOD | Joint Center for Research in the Management of Ocean Data |
| JEDA | Joint Environmental Data Analysis |
| JGE | Journal of Geoscience Education |
| JISM | Jordan Institution for Standards and Metrology |
| JMA | Japanese Meteorological Agency |
| JMFU | Joint METOC Forecast Unit |
| JMOC | Joint METOC Operations Center |
| JPL | Jet Propulsion Laboratory |
| JTWC | Joint Typhoon Warning Center |
| JWX | Japan Weather Exchange |
| KEC-62 | NOAA Weather Radio Station, San Diego, California |